#include <iostream>
#include <random>




void test(){
    //伪随机数分布
    std::default_random_engine  e;
    for(int i=0;i<10;i++){

        std::cout<<e()<<std::endl;

    }


    std::uniform_int_distribution<unsigned>  u(0,9);
    for(size_t i=0;i<10;i++){

        std::cout<<u(e)<<std::endl;

    }

}